Bhagavad Gita 4.28

द्रव्ययज्ञास्तपोयज्ञा योगयज्ञास्तथापरे।स्वाध्यायज्ञानयज्ञाश्च यतयः संशितव्रताः ॥४.२८॥

dravyayajñāstapoyajñā yogayajñāstathāparesvādhyāyajñānayajñāśca yatayaḥ saṃśitavratāḥ

Others again offer wealth, austerity, and Yoga as sacrifice, while ascetics of self-restraint and rigid vows offer the study of scriptures and knowledge as sacrifice.

गीता